Calibration Results forNOAA-11AVHRR Channels 1 and 2 from Congruent Path Aircraft Observations
Open Access
- 1 August 1993
- journal article
- Published by American Meteorological Society in Journal of Atmospheric and Oceanic Technology
- Vol. 10 (4) , 493-508
- https://doi.org/10.1175/1520-0426(1993)010<0493:crfaca>2.0.co;2
Abstract
A method for using congruent atmospheric path aircraft-satellite observations to calibrate a satellite radiometer is presented. A calibrated spectroradiometer aboard a NASA ER-2 aircraft at an altitude of 19 km above White Sands, New Mexico, was oriented to view White Sands at the overpass time of the NOAA-11 Advanced Very High Resolution Radiometer (AVHRR) instrument along the same view vector as the satellite instrument. The data from six flights between November 1988 and October 1990 were transformed into corresponding estimates of AVHRR channel radiance at the satellite (derived from the aircraft measurements), and average counts (from the AVHRR measurements), both averaged across the footprint of the spectroradiometer. Prelaunch measurements of the AVHRR spectral response profiles are assumed, and the radiance spectrum measured by the spectroradiometer was adjusted to satellite altitude using the LOWTRAN-7 computer code. Spatial misregistration of the two flight datasets was corrected by max... Abstract A method for using congruent atmospheric path aircraft-satellite observations to calibrate a satellite radiometer is presented. A calibrated spectroradiometer aboard a NASA ER-2 aircraft at an altitude of 19 km above White Sands, New Mexico, was oriented to view White Sands at the overpass time of the NOAA-11 Advanced Very High Resolution Radiometer (AVHRR) instrument along the same view vector as the satellite instrument. The data from six flights between November 1988 and October 1990 were transformed into corresponding estimates of AVHRR channel radiance at the satellite (derived from the aircraft measurements), and average counts (from the AVHRR measurements), both averaged across the footprint of the spectroradiometer. Prelaunch measurements of the AVHRR spectral response profiles are assumed, and the radiance spectrum measured by the spectroradiometer was adjusted to satellite altitude using the LOWTRAN-7 computer code. Spatial misregistration of the two flight datasets was corrected by max...Keywords
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